Translation of authenticate in Spanish:

transitive verb

He said such evidence could include originals or copies of documents authenticated by the UN fact-finding commission.

The significant problem with both press releases and web pages that describe these items is that they provide little, if any, hard data that authenticates the identification of these items as valid artifacts or bones.

The family claimed asylum in the UK, but, despite evidence that included authenticated documents, their story was not believed and their claim was rejected.